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481  Bitcoin / Mining / Re: 4 Card Motherboard on: April 28, 2011, 04:53:15 AM
This motherboard http://www.newegg.com/Product/Product.aspx?Item=N82E16813130274 with 3 5850 and 2 5770 would be sick! 1260Mhash/s anybody know how much power system would take?

Why not just go 4 x 5850 and get 1.44 GH/s ..

hmmmm what board would you recommend for that

The same board and a case with 8 card slots. http://www.newegg.com/Product/Product.aspx?Item=N82E16813130274
482  Bitcoin / Mining / Re: 4 Card Motherboard on: April 28, 2011, 04:42:41 AM
This motherboard http://www.newegg.com/Product/Product.aspx?Item=N82E16813130274 with 3 5850 and 2 5770 would be sick! 1260Mhash/s anybody know how much power system would take?

Why not just go 4 x 5850 and get 1.44 GH/s ..
483  Bitcoin / Mining / Re: Long Polling Questions on: April 28, 2011, 04:35:29 AM

Before Long Polling, your miners didn't know when somebody else created Block#3, they just kept going on their merry way until it was time for them to ask the pool for more work. This causes a higher percentage of stale results and thus wasted work.

With Long Polling, the pool actively notifies the miners that somebody else created Block#3 and so start working to create Block#4 right away.

Ok, that's what I was missing.
484  Bitcoin / Mining / Re: Determining average expected daily payout from Slush/Deepbit? on: April 28, 2011, 04:25:05 AM
http://bitcoinx.com/profit/index.php is another resource.
485  Bitcoin / Mining / Re: Long Polling Questions on: April 28, 2011, 04:17:51 AM

What???

Somebody creates block#1, somebody creates block#2, somebody creates block#3. What happens to the previous 2 blocks is that people created them. There aren't just blocks sitting out there that need to be worked; people create blocks and add them to the end of the chain.

OK ... I think I'm missing the logic of creating a new block and long polling.

So long polling detects when a new blocks is made and start working on making the next block?
486  Bitcoin / Mining / Re: Long Polling Questions on: April 28, 2011, 03:56:09 AM

What?

Where did this leapfrogging come from? There aren't just like a set of blocks that need to be solved and you can solve them in any order. You have to CREATE a valid block. A valid block points to the most recently created (previous) block.

Somebody created block#1, and then somebody created block#2, #3 and so on.

Now, everybody is working on creating a new block (that will eventually be called block#4) that points to block#3 as the previous block.

If somebody other than you created block#4, the new block that you are trying to create needs to point to block#4 as the previous, not block#3, otherwise it will be invalid.

Not leapfrogging for creating blocks, for verifying them and getting the coins. If 3 blocks are made within 2 minutes, which I have seen happen more than a few times, LP will be sent from the server pool to the clients and they will start working on the last one. My question is what happens to the previous 2. When do they get worked on if they get worked on and how can I tell whether they ever get claimed.
487  Bitcoin / Mining / Re: Long Polling Questions on: April 28, 2011, 02:40:39 AM
The block you are working on contains a link to the previous block in the block chain.

If somebody else finds a block and you don't drop the block you are working on, then the block you are working on is invalid because it is pointing to the wrong previous block. Pointing to the wrong previous block means that you might (likely) have duplicated transactions compared to the previous one that somebody else found.

If all the long polling pools are leapfrogging the block chain, how can we tell that all the blocks are being solved?
Do the non long polling pools and solo miners come behind that and find the blocks that aren't solved and work on them?
488  Bitcoin / Mining / Re: Trouble Overclocking 5850 to 900MHz shader on: April 28, 2011, 02:03:18 AM
Quote
The highest I could get my 5850's to before freezing was 875. I got them up to 900 by flashing them with 5870 BIOS.
Just to be clear, you had to flash your BIOS to make it stable, or to even set it to 900?

I can set my card to 900 MHz no problem. It's just that the display freezes and I have to do a restart (REISUB).

What does that BIOS do that would prevent the card from failing at higher clock speeds?

Just to be able to get to 900 core speed. Mine wouldn't go past 875.

The 5870 bios ups the voltage allowing it to run at higher clock speeds.

On the Reference boards most of the PCB's are the same, the 5850 just has less stream processors.
489  Bitcoin / Mining / Long Polling Questions on: April 28, 2011, 01:36:30 AM
It looks like every time a new block is generated on www.bitcoinmonitor.com Long Polling kicks in on mining clients and the pool start working on the most current block. Is this correct?

That seems to be extremely inefficient constantly dumping work every time a new block is created. If a new block is generated every 10 minutes then each block only gets 10 minutes of work (abeit from each long polling pool) before it's dumped and moves onto the next block. I've seen 3 new block created within 2-3 minutes of each other, and as many as 12 in an hour.

Wouldn't it be more efficient to skip x number of new blocks, relative to pool speed, while working on a block until the pool solves it, or detect that someone else has claimed/solved it?

I haven't been able to tell from looking at blockexplorer.com how to find out if a block has been claimed/solved.

490  Bitcoin / Mining / Re: Trouble Overclocking 5850 to 900MHz shader on: April 28, 2011, 01:20:03 AM
I recently bought a Sapphire HD 5850 ($150 after taxes) ... so I can race it against my FPGAs  Tongue

I have Ubuntu 10.10 32-bit, fglrx 8.801, 2.1 SDK. Using aticonfig I can overclock up to 900MHz, which is good enough for me, except that at that speed it freezes within a few seconds (screen no longer responds; have to REISUB). It ran overnight at 765MHz just fine. In Windows it could run at 900MHz for about an hour, and then Windows restarts the driver because it stops responding.

Is my card just a weak batch and won't ever get to 900MHz stable, or is there something else I can do?

Thank you!

The highest I could get my 5850's to before freezing was 875. I got them up to 900 by flashing them with 5870 BIOS.
http://www.techpowerup.com/vgabios/61848/ATI.HD5870.1024.091112.html
491  Bitcoin / Mining software (miners) / Re: [MINER] Phoenix - New efficient, fast, modular miner **BFI_INT support!** on: April 27, 2011, 07:18:51 PM
Changed from 1.2 to 1.3 and it started sending Warning: work queue empty, miner is idle. :s.
If I run 1.2 it doesn´t happen.



So far I have only seen mine do that right before a Long Poll update when a block was found.

What were the circumstances? Was it right before or after a Long Poll Update? What pool are you using?
492  Bitcoin / Mining software (miners) / Re: [MINER] Phoenix - New efficient, fast, modular miner **BFI_INT support!** on: April 27, 2011, 04:53:26 PM
So I am running this on a stock 5870 and I am getting almost exactly the same hashrate as poclbm.  Has poclbm been updated or is there something wrong with my command line for phoenix.

I'm using:

./phoenix.py -u <url> -k poclbm VECTORS=on BFI_INT AGGRESSION=13 WORKSIZE=128 DEVICE=1

Should I be using something different?  Getting 365 Mh/s in both poclbm and phoenix.


Try different AGGRESSION .. 12 was better than 13 or 11 for me.
Try lowering the WORKSIZE to 64, and try it without it completely.

Adding WORKSIZE, not matter what size, dropped my speed 10 Mh/s. I haven't had a problem running without it.
493  Bitcoin / Mining / Re: 4 Card Motherboard on: April 27, 2011, 09:57:10 AM


The reference ones are better.

Duly noted, the ones with the full covering around the heatsink and the squirrel cage fan?

http://www.newegg.com/Product/Product.aspx?Item=N82E16814129141&cm_re=hd_5850-_-14-129-141-_-Product

The turbine style fan at the end in the middle guides air all the way down the length of the card and forces most of it out the back of the case.
494  Bitcoin / Mining / Re: How do I get Windows 7 to enable my 2nd, 3rd, and 4th gpu? on: April 27, 2011, 07:02:16 AM
Unless you have enough ports on your monitor to plug them in, or another monitor you can plug them into, that's the easiest way to do it.
495  Bitcoin / Mining / Re: 5970? ubuntu? on: April 27, 2011, 03:53:22 AM

Is it correct that you can only have up to 8 cores in linux ? Meaning you can connect a maximum of 4x 5970s for ex. ?

Yep. This guy http://blog.zorinaq.com/?e=42 accomplished it with some serious hardware hacking.

If I had the money this http://www.newegg.com/Product/Product.aspx?Item=N82E16813130274 would be my dream board.
496  Bitcoin / Mining / Re: 4 Card Motherboard on: April 27, 2011, 03:33:56 AM

$249 with a $50 rebate:
http://www.microcenter.com/single_product_results.phtml?product_id=0331363

i just picked up a couple.  and the cheapest 5850s are only twenty bucks less:
http://www.microcenter.com/single_product_results.phtml?product_id=0346683

MicroCenter is better than NewEgg - and i have one just down the road...


The same 5850 is $40 cheaper on newegg with rebate.

The coolers on those cards are nice but they don't vent out of the case, they just pass they heat issue from the card to the case.

The reference ones are better.
497  Bitcoin / Mining software (miners) / Re: [MINER] Phoenix - New efficient, fast, modular miner **BFI_INT support!** on: April 26, 2011, 12:33:45 PM
Can't seem to get this to work. When i extract the zip i get a folder and phoenix.exe

when i tried running the exe, the cmd window goes up then disappears.

I tried xp sp2 and vista sp2 compatibility mode

ran as admin

im on win7 x64

11.4 preview catalyst.

6950 unlocked and 5870 on the rig.

It's not a graphical application ... you need to open a command prompt and run it that way.
498  Bitcoin / Mining / Re: Building a Mining Rig - Specs on: April 26, 2011, 06:49:02 AM

4 5850's would be the max you can have in any system.
499  Bitcoin / Mining / Re: 5970? ubuntu? on: April 25, 2011, 09:39:37 PM

This is a total noob question but how does one find out how many cores for the 5970?

Also, does it matter if its a 2GB or a 4GB 5970?

How does one join a pool?

There are 2 GPU's (Cores) on the 5970 and 6990. All 5800 and 6800 series have 1 GPU each.

There are quite a few pools, each has their own benefits and drawbacks. The biggest difference between all of them is speed. They vary right now between 200 Mh/s and 15 Mh/s. The bigger the pool, the smaller payment you get, but they are more frequent ... smaller pools don't solve as many blocks but have higher rewards. Once your system is set up you download a client and connect it to a user account set up on a pool website.

The pools are (sorted by current speed high to low) at http://mining.bitcoin.cz, deepbit.net, bitcoinpool.com and btcmine.com.
500  Bitcoin / Mining / Re: 5970? ubuntu? on: April 25, 2011, 09:12:03 PM

The 5970 is roughly equivalent to my 2x 5850's and I am getting that on average right now as part of a pool.


Alone (w/o a pool), one wouldn't get the same?

There's no guarantee when you mine alone. Pools help keep the income more toward average.

You might want to look at this site. http://www.alloscomp.com/bitcoin/calculator.php

Right now the 5970 is rated at ~600 Mh/s. I'm sure it can get better with phoenix client.

Edit: Looks like phoenix is getting 347 per core or just under 700 Mh/s.

At 600 Mh/s it would take 7.75 days on average to get 50 BTC on average. But it could take up to 3 weeks.
Even at 700 Mhz it could take 6.5 days on average or 19.5 days if it runs long.



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